161250105 has 16 divisors (see below), whose sum is σ = 260507520. Its totient is φ = 85164288.

The previous prime is 161250101. The next prime is 161250113. The reversal of 161250105 is 501052161.

It is not a de Polignac number, because 161250105 - 2² = 161250101 is a prime.

It is a super-2 number, since 2×161250105² = 52003192725022050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (161250101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50640 + ... + 53729.

It is an arithmetic number, because the mean of its divisors is an integer number (16281720).

Almost surely, 2^161250105 is an apocalyptic number.

161250105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161250105 is a deficient number, since it is larger than the sum of its proper divisors (99257415).

161250105 is a wasteful number, since it uses less digits than its factorization.

161250105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104480.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 161250105 is about 12698.4292335706. The cubic root of 161250105 is about 544.2937348677.

The spelling of 161250105 in words is "one hundred sixty-one million, two hundred fifty thousand, one hundred five".